Expert Flyer scrap times for Reward Availability?

Hi all,
I have a Reward Availability alert set up on EF for G availability on a specific flight. Annoyingly, when I checked the VS app yesterday (as I do most days when looking for Gs) the flight showed availability. I called FC but it had gone by the time I called
.
I would have thought the EF alert should have emailed me when this came available, but it makes me think they scrap the site at certain times rather than instantly. Anyone have any insight into this?
I have a Reward Availability alert set up on EF for G availability on a specific flight. Annoyingly, when I checked the VS app yesterday (as I do most days when looking for Gs) the flight showed availability. I called FC but it had gone by the time I called

I would have thought the EF alert should have emailed me when this came available, but it makes me think they scrap the site at certain times rather than instantly. Anyone have any insight into this?